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US Eastern Time Zone NTP servers

tick.usno.navy.mil
Location: Time Service Dept., U.S. Naval Observatory, Washington, DC
Synchronization: NTP V4 primary (USNO Master Clock H-masers)
Access Policy: Open access for MIL, GOV, and other stratum 2 servers.

tock.usno.navy.mil
Location: Time Service Dept., U.S. Naval Observatory, Washington, DC
Synchronization: NTP V4 primary (USNO Master Clock H-masers)
Access Policy: Open access for MIL, GOV, and other stratum 2 servers.
 
ntp2.usno.navy.mil
Location: Time Service Dept., U.S. Naval Observatory, Washington, DC
Synchronization: NTP V4 primary (USNO Master Clock H-masers)
Access Policy: Open access for MIL, GOV, and other stratum 2 servers.

 
Commander, Naval Meteorology and Oceanography Command | 1100 Balch Blvd. | Stennis Space Center, Mississippi 39529